diff --git a/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj b/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj
index 70bb126..4cd582e 100644
--- a/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj
+++ b/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj
@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>HaoYueNet.ClientNetworkNet4x</RootNamespace>
     <AssemblyName>HaoYueNet.ClientNetworkNet4x</AssemblyName>
-    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <Deterministic>true</Deterministic>
     <TargetFrameworkProfile />
diff --git a/NetLib/HaoYueNet.ClientNetworkNet4x/app.config b/NetLib/HaoYueNet.ClientNetworkNet4x/app.config
index ca8a1fe..0dd6396 100644
--- a/NetLib/HaoYueNet.ClientNetworkNet4x/app.config
+++ b/NetLib/HaoYueNet.ClientNetworkNet4x/app.config
@@ -1,11 +1,11 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>
-        <assemblyIdentity name="System.Memory" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.0.1.2" newVersion="4.0.1.2" />
+        <assemblyIdentity name="System.Memory" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral"/>
+        <bindingRedirect oldVersion="0.0.0.0-4.0.1.2" newVersion="4.0.1.2"/>
       </dependentAssembly>
     </assemblyBinding>
   </runtime>
-</configuration>
\ No newline at end of file
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2"/></startup></configuration>